building=yes is a standard way to mark building without specifying its type. Editors wishing to specify building type would (directly or indirectly, for example using StreetComplete) look through buildings tagged as building=yes.
building=building is an unexpected way to mark building without specifying its type and therefore retagging this duplicate to building=yes would improve tagging without any information loss. It would also (as an useful byproduct) remove this tag from popular values at https://taginfo.openstreetmap.org/keys/building#values <https://taginfo.openstreetmap.org/keys/building#values> and ensure that it will not become proposed as a valid value by an iD editor (at this moment threshold for building value is 14514 uses). Between 4000 and 5000 objects are expected to be edited. See https://taginfo.openstreetmap.org/tags/building=building#map <https://taginfo.openstreetmap.org/tags/building=building#map> for a geographic distribution. Changeset would be split into small areas to avoid continent-sized bounding boxes. As this tag is on buildings it is not expected that any object will force bounding box to be extremely large. For documentation page see https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account/moving_building%3Dbuilding_to_building%3Dyes <https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account/moving_building%3Dbuilding_to_building%3Dyes> For documentation of my previous proposals (including both proposals that failed to be approved and approved ones) see https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account <https://wiki.openstreetmap.org/wiki/Mechanical_Edits/Mateusz_Konieczny_-_bot_account>
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